I was tipped off to a gasket maker made and sold only through Caterpillar dealers that far outperforms anything I have ever used (believe it or not, it's not yellow, but blue). This is not silicone and never hardens and if you have to get back inside of the cover/part again it wipes right off with MEK or the like. Truthfully, I cannot remember the last time I have used any paper gaskets. I've tried permatex, etc. and have never had the consistent reliable results as that of the Caterpillar stuff. It is quite pricey @ about $16 for a fairly small tube. One tube is enough for a complete engine, trans and diff overhaul. Keep in mind, this is not going to take place of any thick cork gaskets but works great in place of the thin ones.